I was exactly the same my waters broke during the pushing stages last time. My midwife says there a straw colour and smell sweet so you will definately be able to tell if they go and also they make a pop sound and you may feel pressure down below. Although she did say they tend to trickle and not gush as babys head acts as a plug until you contract.

Mine went when I was sleeping in the afternoon. I didn't hear a pop and it didn't even waken me up. My husband woke me an hour later and then had broke and I was socking. I was 5 1/2 weeks early so didn't expect this. My lo was born that night.